URL https://opencores.org/ocsvn/test_project/test_project/trunk

Subversion Repositories test_project

[/] [test_project/] [trunk/] [linux_sd_driver/] [net/] [sched/] [sch_fifo.c] - Blame information for rev 62

Details | Compare with Previous | View Log


/*
 * net/sched/sch_fifo.c The simplest FIFO queue.
 *
 *              This program is free software; you can redistribute it and/or
 *              modify it under the terms of the GNU General Public License
 *              as published by the Free Software Foundation; either version
 *              2 of the License, or (at your option) any later version.
 *
 * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
 */
 
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/skbuff.h>
#include <net/pkt_sched.h>
 
/* 1 band FIFO pseudo-"scheduler" */
 
struct fifo_sched_data
{
        u32 limit;
};
 
static int bfifo_enqueue(struct sk_buff *skb, struct Qdisc* sch)
{
        struct fifo_sched_data *q = qdisc_priv(sch);
 
        if (likely(sch->qstats.backlog + skb->len <= q->limit))
                return qdisc_enqueue_tail(skb, sch);
 
        return qdisc_reshape_fail(skb, sch);
}
 
static int pfifo_enqueue(struct sk_buff *skb, struct Qdisc* sch)
{
        struct fifo_sched_data *q = qdisc_priv(sch);
 
        if (likely(skb_queue_len(&sch->q) < q->limit))
                return qdisc_enqueue_tail(skb, sch);
 
        return qdisc_reshape_fail(skb, sch);
}
 
static int fifo_init(struct Qdisc *sch, struct rtattr *opt)
{
        struct fifo_sched_data *q = qdisc_priv(sch);
 
        if (opt == NULL) {
                u32 limit = sch->dev->tx_queue_len ? : 1;
 
                if (sch->ops == &bfifo_qdisc_ops)
                        limit *= sch->dev->mtu;
 
                q->limit = limit;
        } else {
                struct tc_fifo_qopt *ctl = RTA_DATA(opt);
 
                if (RTA_PAYLOAD(opt) < sizeof(*ctl))
                        return -EINVAL;
 
                q->limit = ctl->limit;
        }
 
        return 0;
}
 
static int fifo_dump(struct Qdisc *sch, struct sk_buff *skb)
{
        struct fifo_sched_data *q = qdisc_priv(sch);
        struct tc_fifo_qopt opt = { .limit = q->limit };
 
        RTA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt);
        return skb->len;
 
rtattr_failure:
        return -1;
}
 
struct Qdisc_ops pfifo_qdisc_ops = {
        .id             =       "pfifo",
        .priv_size      =       sizeof(struct fifo_sched_data),
        .enqueue        =       pfifo_enqueue,
        .dequeue        =       qdisc_dequeue_head,
        .requeue        =       qdisc_requeue,
        .drop           =       qdisc_queue_drop,
        .init           =       fifo_init,
        .reset          =       qdisc_reset_queue,
        .change         =       fifo_init,
        .dump           =       fifo_dump,
        .owner          =       THIS_MODULE,
};
 
struct Qdisc_ops bfifo_qdisc_ops = {
        .id             =       "bfifo",
        .priv_size      =       sizeof(struct fifo_sched_data),
        .enqueue        =       bfifo_enqueue,
        .dequeue        =       qdisc_dequeue_head,
        .requeue        =       qdisc_requeue,
        .drop           =       qdisc_queue_drop,
        .init           =       fifo_init,
        .reset          =       qdisc_reset_queue,
        .change         =       fifo_init,
        .dump           =       fifo_dump,
        .owner          =       THIS_MODULE,
};
 
EXPORT_SYMBOL(bfifo_qdisc_ops);
EXPORT_SYMBOL(pfifo_qdisc_ops);

Line No.	Rev	Author	Line
1	62	marcus.erl	`/*`
2			`* net/sched/sch_fifo.c The simplest FIFO queue.`
3			`*`
4			`* This program is free software; you can redistribute it and/or`
5			`* modify it under the terms of the GNU General Public License`
6			`* as published by the Free Software Foundation; either version`
7			`* 2 of the License, or (at your option) any later version.`
8			`*`
9			`* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>`
10			`*/`
11
12			`#include <linux/module.h>`
13			`#include <linux/types.h>`
14			`#include <linux/kernel.h>`
15			`#include <linux/errno.h>`
16			`#include <linux/skbuff.h>`
17			`#include <net/pkt_sched.h>`
18
19			`/* 1 band FIFO pseudo-"scheduler" */`
20
21			`struct fifo_sched_data`
22			`{`
23			`u32 limit;`
24			`};`
25
26			`static int bfifo_enqueue(struct sk_buff skb, struct Qdisc sch)`
27			`{`
28			`struct fifo_sched_data *q = qdisc_priv(sch);`
29
30			`if (likely(sch->qstats.backlog + skb->len <= q->limit))`
31			`return qdisc_enqueue_tail(skb, sch);`
32
33			`return qdisc_reshape_fail(skb, sch);`
34			`}`
35
36			`static int pfifo_enqueue(struct sk_buff skb, struct Qdisc sch)`
37			`{`
38			`struct fifo_sched_data *q = qdisc_priv(sch);`
39
40			`if (likely(skb_queue_len(&sch->q) < q->limit))`
41			`return qdisc_enqueue_tail(skb, sch);`
42
43			`return qdisc_reshape_fail(skb, sch);`
44			`}`
45
46			`static int fifo_init(struct Qdisc sch, struct rtattr opt)`
47			`{`
48			`struct fifo_sched_data *q = qdisc_priv(sch);`
49
50			`if (opt == NULL) {`
51			`u32 limit = sch->dev->tx_queue_len ? : 1;`
52
53			`if (sch->ops == &bfifo_qdisc_ops)`
54			`limit *= sch->dev->mtu;`
55
56			`q->limit = limit;`
57			`} else {`
58			`struct tc_fifo_qopt *ctl = RTA_DATA(opt);`
59
60			`if (RTA_PAYLOAD(opt) < sizeof(*ctl))`
61			`return -EINVAL;`
62
63			`q->limit = ctl->limit;`
64			`}`
65
66			`return 0;`
67			`}`
68
69			`static int fifo_dump(struct Qdisc sch, struct sk_buff skb)`
70			`{`
71			`struct fifo_sched_data *q = qdisc_priv(sch);`
72			`struct tc_fifo_qopt opt = { .limit = q->limit };`
73
74			`RTA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt);`
75			`return skb->len;`
76
77			`rtattr_failure:`
78			`return -1;`
79			`}`
80
81			`struct Qdisc_ops pfifo_qdisc_ops = {`
82			`.id = "pfifo",`
83			`.priv_size = sizeof(struct fifo_sched_data),`
84			`.enqueue = pfifo_enqueue,`
85			`.dequeue = qdisc_dequeue_head,`
86			`.requeue = qdisc_requeue,`
87			`.drop = qdisc_queue_drop,`
88			`.init = fifo_init,`
89			`.reset = qdisc_reset_queue,`
90			`.change = fifo_init,`
91			`.dump = fifo_dump,`
92			`.owner = THIS_MODULE,`
93			`};`
94
95			`struct Qdisc_ops bfifo_qdisc_ops = {`
96			`.id = "bfifo",`
97			`.priv_size = sizeof(struct fifo_sched_data),`
98			`.enqueue = bfifo_enqueue,`
99			`.dequeue = qdisc_dequeue_head,`
100			`.requeue = qdisc_requeue,`
101			`.drop = qdisc_queue_drop,`
102			`.init = fifo_init,`
103			`.reset = qdisc_reset_queue,`
104			`.change = fifo_init,`
105			`.dump = fifo_dump,`
106			`.owner = THIS_MODULE,`
107			`};`
108
109			`EXPORT_SYMBOL(bfifo_qdisc_ops);`
110			`EXPORT_SYMBOL(pfifo_qdisc_ops);`

Browse

Tools

Subversion Repositories test_project

[/] [test_project/] [trunk/] [linux_sd_driver/] [net/] [sched/] [sch_fifo.c] - Blame information for rev 62